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Warren Buffett criticized Donald Trump for his recent comments about a family whose son died fighting in Iraq, and challenged Trump to show his tax returns at a rally in Omaha, Nebraska, on Aug. 1, 2016. (Published Tuesday, Aug. 2, 2016)

When billionaire investor Warren Buffett introduced Hillary Clinton at a Nebraska campaign event Monday, he made an announcement that he said would be news even to the Democratic nominee for president.

Buffett pledged to "take at least 10 people to the polls who otherwise would have had difficulty getting there" on November 8, challenging his congressional district to "give America a civics lesson."

He launched a website, Drive2vote, where people can sign up for a ride or to give a ride on Election Day, as well as to register to vote.

"My goal is to have the turnout here be the highest percentage of potential voters of any district in the country," Buffett told the crowd in Omaha.

Buffet, a famed investor and one of the wealthiest people in America, endorsed Clinton last year.

The "Oracle of Omaha," as Buffett is sometimes called, said he even reserved a trolley called "Ollie" Monday. "It seats 32, I’m gonna be on it all day, I’m gonna be doing selfies, whatever it takes," Buffett said.

Clinton thanked Buffett for the introduction before transitioning into her rally. As it finished, she said that if she wins the election, she will "come back here and Warren and I will dance of the streets of Omaha together!"

Her campaign is seeking to highlight support from the business community. Buffett is the latest business leader to back Clinton over Republican Donald Trump. She appeared with Dallas Mavericks owner Mark Cuban in Pittsburgh over the weekend and former New York City mayor Michael Bloomberg spoke on her behalf at the Democratic National Convention.

Buffett also discussed Clinton's rival for the White House, saying "La-di-da" of Trump's Republican National Convention assertion that he's the only one who can fix the country's ills.

"It takes some kind of nerve, or something else, to really have the notion that out of 335 million people you're the only one who can fix it," Buffett continued.

Clinton said she wants to be "the small business president," and took issue with the way Trump has allegedly not paid contractors for their work, referring apparently to the bankruptcy of his Trump Taj Mahal casino in Atlantic city in the 1990s.

"That is just not the way we do business in America. We make good on our promises," she said, noting the issue was important to her because her father was a small businessman.